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TPS658620ZQZT датащи(PDF) 76 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 76 Page - Texas Instruments |
76 / 104 page 3.60 SWITCHING BETWEEN INTERNAL AND CRYSTAL CLOCK SELECT CRYSTAL CLOCK CRYSTAL CLOCK INTERNAL 32K RTCCLOCK 3.61 CRYSTAL OSCILLATOR TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com The alarm logic compares the RTC_ALARM1 register bits to the RTC_COUNT registers as follows: With prescaler enabled: ALM1[23:0] is compared to RTC[23:0] With prescaler disabled: ALM1[23:0] is compared to RTC[28:5] An interrupt is sent to the host (if enabled via I2C, see interrupt controller section) when the alarm logic detects that the RTC_COUNT value is equal to the pre-programmed ALARM1 register value. The alarm logic compares the RTC_ALARM2 register bits to the RTC_COUNT registers as follows: With prescaler enabled: ALM2[23:0] is compared to RTC[22:7] With prescaler disabled: ALM2[15:0] is compared to RTC[27:12] An interrupt is sent to the host (if enabled via I2C, see interrupt controller section) and the sleep mode ends when the alarm logic detects that the RTC_COUNT value is equal to the pre-programmed ALARM2 register value. Table 3-54. RTC Alarm RTC_ALARM1_HI [ADDRESS=0xC1] Default to 0 Bit Number B7 B6 B5 B4 B3 B2 B1 B0 Bit Name ALM1[23] ALM1[22] ALM1[21] ALM1[20] ALM1[19] ALM1[18] ALM1[17] ALM1[16] RTC_ALARM1_MID [Addr 0xC2] Default to 0 Bit Name ALM1[15] ALM1[14] ALM1[13] ALM1[12] ALM1[11] ALM1[10] ALM1[9] ALM1[8] RTC_ALARM1_LO [Addr 0xC3] Default to 0 Bit Name ALM1[7] ALM1[6] ALM1[5] ALM1[4] ALM1[3] ALM1[2] ALM1[1] ALM1[0] RTC_ALARM2_HI [Addr 0xC4] Default to 0 Bit Name ALM2[15] ALM2[14] ALM2[13] ALM2[12] ALM2[11] ALM2[10] ALM2[9] ALM2[8] RTC_ALARM2_LO [Addr 0xC5 Default to 0 Bit Name ALM2[7] ALM2[6] ALM2[5] ALM2[4] ALM2[3] ALM2[2] ALM2[1] ALM2[0] When switching between the internal clock to the crystal clock, an internal logic extends the LO time of the clock sent to the counter to avoid undesired glitches. A typical clock switching timing diagram is shown below: The crystal oscillator has internal load capacitances, in order to allow a typical 32K crystal to operate as described in the electrical characteristics tables. The TPS658620 has four integrated capacitors that can be connected to the XTAL1, XTAL2 pins as defined by control bits CL_SEL[1:0] in register RTC_CTRL, effectively applying a load capacitance to the external crystal. 76 DETAILED DESCRIPTION Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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